Theed Royal Palace

Opal Palace
{t}: Add {c} to your mana pool.
{1}, {t}: Add to your mana pool one mana
of any color in your commander's color
identity. If you spend this mana to cast
your commander, it enters the battlefield
with a number of additional +1/+1 counters
on it equal to the number of times it's been
cast from the command zone this game.